Kibblewhite KPMI Black Diamond Valve Kit for Harley-Davidson Sportster (1957–1969) – 20-22200

Upgrade your 1957–1969 Harley‑Davidson Sportster valvetrain with the KPMI Black Diamond Valve Kit. The kit uses Black Diamond stainless steel valves impregnated with a German process to a depth of.002" and a surface buildup of.0002", delivering wear resistance and reduced friction that surpass chrome or nickel plating. These valves are designed to endure the high temperatures and sustained pressures of spirited riding and classic restoration alike.

Engineered for precise fit and reliable operation, the kit’s valves are one-piece forgings that balance strength with lightweight performance. Each valve profile is developed through Finite Element Analysis and validated on a flow bench, ensuring efficient airflow and dependable performance across the Sportster’s working range. The packaging includes all essential components for a complete rebuild or upgrade, including durable valves, springs, and seals designed for longevity.

Compatibility and use cases

• Designed specifically for Harley-Davidson Sportster models from 1957 to 1969 (XL, early Evolution era).
• Suitable for engine rebuilds, restorations, and performance upgrades where durable, high‑temperature components are required.

Key specifications (intake side shown as example from the range): head diameter ≈ 46.36 mm (1.825 in) and stem diameter ≈ 0.3090 in, with tulip head and a 23° seat angle designed to optimize flow. These dimensional details help confirm precise replacement and compatibility with OEM valvetrain geometry for the era.

All KPMI® Black Diamond™ Stainless steel valves are impregnated by a special German process to a depth of.002, with a surface buildup of.0002. This Black Diamond™ process improves wear properties, reduces friction, and provides resistance to crosion and wear that is superior to chrome and nickel electrolysis plating. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Black Diamond™ Valves are lightweight, strong, one piece forgings with profiles that provide excellent flow characteristics.

The Kibblewhite KPMI Valve Kit, designed specifically for Harley-Davidson Sportster models from 1957 to 1969, offers a comprehensive solution for engine rebuilds and performance upgrades. This kit includes high-quality components engineered to enhance engine efficiency, improve airflow, and ensure durability under demanding riding conditions. Crafted with precision, the parts in this kit are suitable for both restoration projects and performance enhancements, making it a valuable addition to any Harley-Davidson enthusiast's toolkit.

Each component in the Kibblewhite KPMI Valve Kit is manufactured to exact specifications, ensuring perfect fit and reliable operation. The kit features durable valves, springs, and seals that withstand high temperatures and pressures typical of Harley-Davidson engines. Whether you're restoring a vintage bike or upgrading for better performance, this kit provides the essential parts needed to maintain engine integrity and extend the lifespan of your Harley.

Designed with ease of installation in mind, the Kibblewhite KPMI Valve Kit simplifies the maintenance process, allowing for a more efficient rebuild or upgrade. The kit's components are made from premium materials, ensuring long-lasting performance and resistance to wear. Trust Kibblewhite's reputation for quality and precision craftsmanship to keep your Harley-Davidson running smoothly for miles to come.

Features:

• Designed specifically for Harley-Davidson Sportster models from 1957 to 1969

• Includes high-quality valves, springs, and seals for reliable performance

• Manufactured with precision to ensure perfect fit and durability

• Suitable for engine rebuilds, restorations, and performance upgrades

• Constructed from premium materials to withstand high temperatures and pressures